user
Send an email to a colleague with the details of a meeting

Hello John,
 
I would like to invite you to a meeting next Tuesday at 10am. The meeting will be held in the conference room on the 3rd floor.


assistant
Dear John,
 
I hope you are doing well. I am writing to invite you to a meeting next Tuesday at 10am in the conference room on the 3rd floor. We will discuss important matters for the company. 
 
I look forward to seeing you then. 
 
Best regards,
[Your Name]